Altera Cyclone IV Device Handbook page 214

8–50
When programming a JTAG device chain, one JTAG-compatible header is connected
to several devices. The number of devices in the JTAG chain is limited only by the
drive capability of the download cable. When four or more devices are connected in a
JTAG chain, Altera recommends buffering the TCK, TDI, and TMS pins with an on-board
buffer.
JTAG-chain device programming is ideal when the system contains multiple devices,
or when testing your system with JTAG BST circuitry.
show multi-device JTAG configuration.
For devices using 2.5-, 3.0-, and 3.3-V V
I/O inputs must maintain a maximum AC voltage of 4.1 V because JTAG pins do not
have the internal PCI clamping diodes to prevent voltage overshoot when using 2.5-,
3.0-, and 3.3- V V
a 2.5-V V
Figure
V
CCIO
Figure 8–25. JTAG Configuration of Multiple Devices Using a Download Cable (2.5, 3.0, and 3.3-V V
JTAG Pins)
Download Cable
V
V
CCIO
10-Pin Male Header CCA
(6)
Pin 1
V
(5) V
CCA
CCA
(2)
(2)
(6)
(2)
(2)
(2)
VIO
(3)
1 kΩ
Notes to Figure 8–25:
(1) Connect these pull-up resistors to the V
(2) Connect the nCONFIG and MSEL pins to support a non-JTAG configuration scheme. If you only use a JTAG configuration, connect the nCONFIG
pin to logic-high and the MSEL pins to GND. In addition, pull DCLK and DATA[0] to either high or low, whichever is convenient on your board.
(3) Pin 6 of the header is a V reference voltage for the MasterBlaster output driver. V
IO
MasterBlaster Serial/USB Communications Cable User
ByteBlaster II cables, this pin is connected to nCE when it is used for AS programming, otherwise it is a no connect.
(4) You must connect the nCE pin to GND or driven low for successful JTAG configuration.
(5) Power up the V of the ByteBlaster II, USB-Blaster, or ByteBlasterMV cable with a 2.5-V supply from V
CC
to 2.5 V. Pin 4 of the header is a V
circuit boards, DC power supply, or 5.0 V from the USB cable. For this value, refer to the
Guide.
(6) Resistor value can vary from 1 k to 10 k.
Cyclone IV Device Handbook,
Volume 1
Chapter 8: Configuration and Remote System Upgrades in Cyclone IV Devices
supply. You must power up the V
CCIO
supply. For device using V
CCA
8–26. You can power up the V
.
(1) V (1)
CCIO
Cyclone IV Device
10 kΩ
10 kΩ
nST A TUS
(2)
DATA[0]
(2)
DCLK
(2)
CONF_DONE
nCONFIG
(2)
MSEL[ ]
(2)
nCEO
nCE (4)
TDI
TDO
TMS TCK
supply of the bank in which the pin resides.
CCIO
Guide. In the ByteBlasterMV cable, this pin is a no connect. In the USB-Blaster and
power supply for the MasterBlaster cable. The MasterBlaster cable can receive power from either 5.0- or 3.3-V
CC
supply, you must refer to
CCIO
of 1.2, 1.5 V, and 1.8 V, refer to
CCIO
of the download cable with the supply from
CC
V
V
(1) (1)
CCIO
CCIO
10 kΩ 10 kΩ
Cyclone IV Device
nST A TUS
DATA[0]
DCLK
CONF_DONE
nCONFIG
MSEL[ ]
nCEO
nCE (4)
TDI
TDO
TMS TCK
must match the V
IO
MasterBlaster Serial/USB Communications Cable User
Configuration
Figure 8–25 and Figure 8–26
Figure 8–25. All
of the download cable with
CC
Powering the
CCIO
V
V
(1) (1)
CCIO
CCIO
10 kΩ
Cyclone IV Device
10 kΩ
nST A TUS
(2)
DATA[0]
(2)
DCLK
CONF_DONE
(2)
nCONFIG
(2)
MSEL[ ]
(2) nCEO
nCE (4)
TDI
TDO
TMS TCK
of the device. For this value, refer to the
CCA
. Third-party programmers must switch
CCA
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